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Seagate has admitted its first-generation hybrid hard drives - standard hard disks with an added Flash memory cache - are not providing the promised benefits, but it blamed the discrepancy on PC BIOS and device driver software.

But yesterday, at the start of the week in which the drives officially went on sale, Seagate coughed to the fact the 80, 120 and 160GB drives will not deliver the claimed "order of magnitude" improvement over standard 2.5in, 5400rpm hard drives, ExtremeTech reports.

"[Hybrid hard drive technology] is just not getting the orders of magnitude experiences that Microsoft originally touted," Seagate Product Manager Melissa Johnson told the site.

"There are issues both with the BIOS and devices drivers - they don't know how to utilize the Flash, she accused.